A Japanese professor noticed this happen. He told the program to translate a Japanese version of Hemingway's “The Snows of Kilimanjaro” into English. In 24 hours, Google Translate went from producing this:

"Kilimanjaro is 19,710 feet of the mountain covered with snow, and it is said that the highest mountain in Africa. Top of the west, “Ngaje Ngai” in the Maasai language, has been referred to as the house of God. The top close to the west, there is a dry, frozen carcass of a leopard. Whether the leopard had what the demand at that altitude, there is no that nobody explained."

to this:

"Kilimanjaro is a mountain of 19,710 feet covered with snow and is said to be the highest mountain in Africa. The summit of the west is called “Ngaje Ngai” in Masai, the house of God. Near the top of the west there is a dry and frozen dead body of leopard. No one has ever explained what leopard wanted at that altitude."

In his article, Lewis-Kraus noted that "Even to a native English speaker, the missing article on the leopard is the only real giveaway that [the passage] was the output of an automaton."